Use the Chabad corporate for Enterprise, go for a full size, then when u get there, they usually have loads of convertibles witting in the lot, just ask then to upgrade, they will prob give it to you for another $5 a day or something. Ive done it b4, rented a jeep wrangle soft top convertible in fll the same way, they take you to the lot and give u a choice of cars usually and tell them u want the convertible, Chabad is a business account, so, so far Enterprise has always been really nice to me.